Due to her mom's demands? I don't have all of the details in front of me right now, but I recall that ABC was hoping to do a sequel series to Lizzie McGuire, which would've been set in Lizzie's high school years. But the deal fell through when Disney and Hilary Duff's people couldn't come to terms on a financial agreement.

http://www.looper.com/78455/stars-turned-millions-star-sequel/

If you weren't a tween or the parent of a tween in the early 2000s, then the Lizzie McGuire phenomenon probably escaped you. Hilary Duff starred in that Disney Channel series, which combined live-action with animation.*

Lizzie McGuire was so popular that Disney wanted to take it to the big screen. Disney executive Dick Cook was so confident that the movie would be a hit that he offered Duff a two-movie deal (https://books.google.com/books?id=qF5GigayEhQC&pg=PA434&lpg=PA434&dq=walked+away+from+millions+for+sequel&source=bl&ots=EbjrQJelnK&sig=D34beZxKjprdtwXMoV96a4BOu8M&hl=en&sa=X&ved=0ahUKEwi_0NTdx6zVAhWFOiYKHWP7BiYQ6AEIOzAD#v=onepage&q=walked%20away%20from%20millions%20for%20sequel&f=false): $3.5 million for two Lizzie McGuire films, and a $500,000 bonus if the first Lizzie movie made $50 million at the box office.*Duff's mom/manager Susan Duff didn't think that was enough, and asked for $5 million (along with a producer's credit on the movie for herself, and, oddly, a request that Disney pay her cell phone bills). Cook countered with $4 million; the Duffs came back with $4.5 million.*

Cook then said his $4 million was his final offer, take it or leave it, and gave the Duffs a deadline when the offer would expire. A day after that deadline, Susan Duff said she's take the $4 million, but it was too late. And that's why there's only one Lizzie McGuire movie. Susan Duff told Entertainment Weekly (http://ew.com/article/2003/06/13/hilarys-mom-why-duff-left-lizzie-huff/) that although she and her daughter had "walked away from a sequel," Disney had "walked away from a franchise."

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